Treatment System Locations. Treatment System Sampling Activities and Analytical Results. June 15, 2011

Transcription

1 June 15, 2011 Mr. David Anderson Oregon Department of Environmental Quality Eastern Region 475 NE Bellevue Drive, Suite 110 Bend, Oregon Re: Status Report: May 2011 Keno Area Wide Groundwater ARRA DEQ Task Order No /Task 4 Dear Mr. Anderson: This report documents the domestic water supply treatment systems sampling activities conducted in May 2011 as part of the Area Wide Groundwater Investigation in (Figure 1). Additionally, monitoring well MW-4 was sampled as it had been inaccessible during the preceding groundwater sampling event. This project is currently funded by the American Recovery and Reinvestment Act of 2009, and project activities are being performed by Hart Crowser for the Oregon Department of Environmental Quality (DEQ) under Task Order Treatment System Locations Domestic water needs in Keno are currently met by individual groundwater supply wells. Six carbon filtration water supply treatment systems are installed at the Keno Elementary School (Keno School), Whoa Tavern, Klamath River Gas (former known as Keno Gas Station), DeGrande residence, Kingsbury residence, and Welton residence for the purpose of treating produced groundwater that has been impacted by historical gasoline-range petroleum hydrocarbon release(s). The locations of the groundwater supply wells equipped with treatment systems are shown on Figure 2. A treatment system monitoring program is in place to assess influent groundwater quality and filtration treatment effectiveness, and to monitor the carbon filtration sorption/saturation status. Treatment System Sampling Activities and Analytical Results Hart Crowser conducted domestic treatment system sampling activities on May 31, 2011, using procedures described in the February 14, 2002, Water Supply and Groundwater Sampling Work Plan, and in accordance with DEQ s September 8, 2010, UST Program Quality Assurance Project 8910 SW Gemini DR Beaverton, Oregon Fax Tel

2 Oregon Department of Environmental Quality /Task 4 June 15, 2011 Page 2 Plan. In general, the carbon filtration treatment system samples were collected from pretreatment (wellhead influent), intermediate (between the initial and secondary carbon canisters), and posttreatment (after secondary carbon treatment) sampling ports. The Kingsbury, Welton, and DeGrande residences were unoccupied during the May 2011 sampling event, and the treatment systems at these locations were not operating or accessible for sampling. Samples Analyzed for Gasoline, MTBE, and Other RBDM VOCs. Samples were submitted to Apex Laboratories (Apex) located in Tigard, Oregon, and analyzed for gasoline-range total petroleum hydrocarbons (TPH) by Northwest Method NWTPH-Gx and Risk-Based Decision Making (RBDM) volatile organic compounds (VOCs) by EPA Method 8260B. Specific RBDM VOCs include: benzene, toluene, ethylbenzene, and total xylenes (BTEX); methyl tert-butyl ether (MTBE); 1,2-dibromoethane; 1,2-dichloroethane; naphthalene; isopropylbenzene; n-propylbenzene; 1,2,4-trimethylbenzene; and 1,3,5-trimethylbenzene. BTEX and MTBE results from 2006 through this reporting period are listed in Tables 1 through 5. Gasoline-range TPH were not detected in any of the samples collected during the May 2011 sampling event (Table 6). The May 2011 MTBE and BTEX results for the individual treatment systems are discussed below. The laboratory data have been reviewed, and the data are of a suitable quality for the purposes of this project. Laboratory documentation is included as Attachment A to this report. Keno School. MTBE was present in the pretreatment sample at a concentration of 2.09 micrograms per liter (μg/l). MTBE was present in the three intermediate samples at concentrations of 35.1 μg/l, 34.5 μg/l, and 32.0 μg/l. MTBE was detected in the post-treatment sample at a concentration of 1.17 μg/l (Table 1). No other RBDM VOCs were detected in any of the Keno School samples during this reporting period. Whoa Tavern. MTBE was not detected in the pretreatment sample. MTBE was present in the posttreatment sample at 2.07 μg/l (Table 2). No other RBDM VOCs were detected in the Whoa Tavern samples during this reporting period. DeGrande Residence. The DeGrande residence was unoccupied during the May 2011 sampling visit, and the domestic and irrigation wells were not accessible for sampling. Historical ( ) MTBE and BTEX analytical results are summarized in Table 3. Welton Residence. Samples were not collected during the May 2011 sampling event as the well house was locked and residents were not home to gain access to the carbon treatment system. Historical ( ) MTBE and BTEX analytical results are summarized in Table 4.

3 Oregon Department of Environmental Quality /Task 4 June 15, 2011 Page 3 Keno Station. MTBE was not detected in the pretreatment sample. MTBE was present in the intermediate and post-treatment samples at concentrations of 8.71 μg/l and 5.40 μg/l, respectively (Table 5). No other RBDM VOCs were detected in the samples during this reporting period. Kingsbury Residence. The Kingsbury residence has been unoccupied since summer 2009 and electrical power to the residence and well house has been shut off, preventing sample collection. Historical MTBE and BTEX analytical results are summarized in Table 10 of the June 10, 2010, Corrective Action Data Gap Report. Monitoring Well Groundwater Sampling and Analysis The well vault lid for MW-4 had been seized shut during the last two visits to the site, as such, no samples were collected. During the May 2011, visit the well vault lid was removed and a groundwater sample was collected using methods described in the February 14, 2002, Water Supply and Groundwater Sampling Work Plan. Field parameters (dissolved oxygen, ph, specific conductance, and temperature) are listed in Table 7. The groundwater sample was submitted to Apex and analyzed for NWTPH-Gx and RBDM VOCs by EPA Method 8260B, and E. coli by Method SM 9223B. NWTPH-Gx results are listed in Table 6. BTEX and MTBE results are listed in Table 8. Gasoline-range hydrocarbons, MTBE, other RBDM VOCs, and E. coli were not detected in the May 2011 sample from MW-4. Laboratory documentation is included as Attachment A to this report. We appreciate the opportunity to assist DEQ with this project. Please contact us if you have any questions regarding this report. Sincerely, HART CROWSER, INC. CHRIS MARTIN, EIT Senior Engineering Staff RICHARD D. ERNST, RG Task Order Manager

4 Oregon Department of Environmental Quality /Task 4 June 15, 2011 Page 4 Attachments: Table 1 Water Supply Monitoring Data: Keno Elementary School Table 2 Water Supply Monitoring Data: Whoa Tavern Table 3 Water Supply Monitoring Data: DeGrande Residence Table 4 Water Supply Monitoring Data: Welton Residence Table 5 Water Supply Monitoring Data: Keno Station Table 6 Chemical Analysis Results Summary: Gasoline-Range TPH Table 7 Groundwater Elevations and Field Parameters in Monitoring Wells Table 8 Chemical Analysis Results Summary: BTEX and MTBE in Monitoring Wells Figure 1 Site Location Map Figure 2 Site Plan Attachment A Analytical Laboratory Reports cc: Katie Robertson, Oregon DEQ (electronic via ) Steve Campbell, Oregon DEQ (w/o tables and Attachment)

5 Sheet 1 of 4 Table 1 - Water Supply Monitoring Data: Keno Elementary School Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 23-Jan <1.0 <1.0 <1.0 <3.0 Inter 1 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Inter 2 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Inter 3 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Post 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Pre 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 1 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 2 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 3 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Post 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 16-May <1.0 <3.0 Inter 1 16-May <1.0 <1.0 <1.0 <3.0 Inter 2 16-May <1.0 <1.0 <1.0 <3.0 Inter 3 16-May <1.0 <1.0 <1.0 <3.0 Post 16-May <1.0 <1.0 <1.0 <3.0 Pre 26-Jul <1.0 <1.0 <1.0 <30 Inter 1 26-Jul <1.0 <1.0 <1.0 <3.0 Inter 2 26-Jul <1.0 <1.0 <1.0 <3.0 Inter 3 26-Jul <1.0 <1.0 <1.0 <3.0 Post 26-Jul <1.0 <1.0 <1.0 <3.0 Pre 26-Sep <10 <10 <10 <30 Inter 1 26-Sep <1.0 <1.0 <1.0 <3.0 Inter 2 26-Sep <1.0 <1.0 <1.0 <3.0 Inter 3 26-Sep <1.0 <1.0 <1.0 <3.0 Post 26-Sep <1.0 <1.0 <1.0 <3.0 Pre 9-Nov <10 <10 <10 <30 Inter 1 9-Nov <1.0 <1.0 <1.0 <3.0 Inter 2 9-Nov <1.0 <1.0 <1.0 <3.0 Inter 3 9-Nov <1.0 <1.0 <1.0 <3.0 Post 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 23-Jan <10 <10 <10 <30 Inter 1 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 2 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 3 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Post 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 13-Mar <10 <10 <10 <30 Inter 1 13-Mar <1.0 <1.0 <1.0 <3.0 Inter 2 13-Mar <1.0 <1.0 <1.0 <3.0 Inter 3 13-Mar <1.0 <1.0 <1.0 <3.0 Post 13-Mar-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 9-May <1.0 <3.0 Inter 1 9-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 2 9-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 3 9-May <1.0 <1.0 <1.0 <3.0 Post 9-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

6 Sheet 2 of 4 Table 1 - Water Supply Monitoring Data: Keno Elementary School Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 21-Aug <1.0 <1.0 <30 Inter 1 21-Aug-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 2 21-Aug-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 3 21-Aug <1.0 <1.0 <1.0 <3.0 Post 21-Aug-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 25-Sep <10 <10 <10 <30 Inter 1 25-Sep <1.0 <1.0 <1.0 <3.0 Inter 2 25-Sep <1.0 <1.0 <1.0 <3.0 Inter 3 25-Sep <1.0 <1.0 <1.0 <3.0 Post 25-Sep <1.0 <1.0 <1.0 <3.0 Pre 22-Feb-08 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 1 22-Feb <0.500 <0.500 <0.500 <1.00 Inter 2 22-Feb <0.500 <0.500 <0.500 <1.00 Inter 3 22-Feb <0.500 <0.500 <0.500 <1.00 Post 22-Feb < <0.500 <1.00 Pre 18-Apr <0.500 <0.500 <0.500 <1.00 Inter 1 18-Apr <0.500 <0.500 <0.500 <1.00 Inter 2 18-Apr <0.500 <0.500 <0.500 <1.00 Inter 3 18-Apr <0.500 <0.500 <0.500 <1.00 Post 18-Apr <0.500 <0.500 <0.500 <1.00 Pre 18-Jun <0.500 <0.500 <1.00 Inter 1 18-Jun <0.500 <0.500 <0.500 <1.00 Inter 2 18-Jun <0.500 <0.500 <0.500 <1.00 Inter 3 18-Jun <0.500 <0.500 <0.500 <1.00 Post 18-Jun <0.500 <0.500 <0.500 <1.00 Pre 22-Aug <0.500 <0.500 <0.500 <1.00 Inter 1 22-Aug <0.500 <0.500 <0.500 <1.00 Inter 2 22-Aug-08 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 3 22-Aug-08 <1.00 <0.500 <0.500 <0.500 <1.00 Post 22-Aug <0.500 <0.500 <0.500 <1.00 Pre 8-Oct-08 Well House Locked - Not Sampled Inter 1 8-Oct <0.500 <0.500 <0.500 <1.00 Inter 2 8-Oct <0.500 <0.500 <0.500 <1.00 Inter 3 8-Oct <0.500 <0.500 <0.500 <1.00 Post 8-Oct-08 <1.00 <0.500 <0.500 <0.500 <1.00 Pre 8-Dec <2.50 <2.50 <2.50 <5.00 Inter 1 8-Dec <0.500 <0.500 <0.500 <1.00 Inter 2 8-Dec <0.500 <0.500 <0.500 <1.00 Inter 3 8-Dec <0.500 <0.500 <0.500 <1.00 Post 8-Dec <0.500 <0.500 <0.500 <1.00 Pre 11-Feb <0.500 <0.500 <0.500 <1.00 Inter 1 11-Feb <0.500 <0.500 <0.500 <1.00 Inter 2 11-Feb <0.500 <0.500 <0.500 <1.00 Inter 3 11-Feb <0.500 <0.500 <0.500 <1.00 Post 11-Feb <0.500 <0.500 <0.500 <1.00 RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

7 Sheet 3 of 4 Table 1 - Water Supply Monitoring Data: Keno Elementary School Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 28-May <2.50 <2.50 <2.50 <5.00 Inter 1 28-May <1.00 <1.00 <1.00 <2.00 Inter 2 28-May <1.00 <1.00 <1.00 <2.00 Inter 3 28-May <2.50 <2.50 <2.50 <5.00 Post 28-May <2.50 <2.50 <2.50 <5.00 Pre 26-Aug <5.00 <5.00 <10.0 Inter 1 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 2 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 3 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Post 26-Aug <0.500 <0.500 <0.500 <1.00 Pre 7-Oct <0.250 <0.500 <0.500 <1.50 Inter 1 7-Oct-09 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 2 7-Oct-09 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 3 7-Oct-09 <1.00 <0.250 <0.500 <0.500 <1.50 Post 7-Oct <0.250 <0.500 <0.500 <1.50 Pre 2-Dec <0.500 <1.00 <1.00 <3.00 Inter 1 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 2 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 3 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Post 2-Dec <0.250 <0.500 <0.500 <1.50 Pre 18-Feb <0.500 <1.00 <1.00 <3.00 Inter 1 18-Feb-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 2 18-Feb-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 3 18-Feb-10 <1.00 <0.250 <0.500 <0.500 <1.50 Post 18-Feb <0.250 <0.500 <0.500 <1.50 Pre 29-Apr <0.250 <0.500 <0.500 <1.50 Inter 1 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 2 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 3 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Post 29-Apr <0.250 <0.500 <0.500 <1.50 Pre 9-Jun <0.500 <1.00 <1.00 <3.00 Inter 1 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 2 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 3 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Post 9-Jun <0.250 <0.500 <0.500 <1.50 Pre 9-Aug <2.00 <1.00 <3.00 Pre 9-Nov <0.250 <1.00 <0.500 <1.50 Inter 1 9-Nov <0.250 <1.00 <0.500 <1.50 Inter 2 9-Nov <0.250 <1.00 <0.500 <1.50 Inter 3 9-Nov <0.250 <1.00 <0.500 <1.50 Post 9-Nov <0.250 <1.00 <0.500 <1.50 RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

8 Sheet 4 of 4 Table 1 - Water Supply Monitoring Data: Keno Elementary School Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 7-Feb <0.250 <1.00 <0.500 <1.50 Inter 1 7-Feb <0.250 <1.00 <0.500 <1.50 Inter 2 7-Feb <0.250 <1.00 <0.500 <1.50 Inter 3 7-Feb <0.250 <1.00 <0.500 <1.50 Post 7-Feb <0.250 <1.00 <0.500 <1.50 Pre 8-Apr <0.250 <1.00 <0.500 <1.50 Inter 1 8-Apr <0.250 <1.00 <0.500 <1.50 Inter 2 8-Apr <0.250 <1.00 <0.500 <1.50 Inter 3 8-Apr <0.250 <1.00 <0.500 <1.50 Post 8-Apr-11 <1.00 <0.250 <1.00 <0.500 <1.50 Pre 31-May <0.250 <1.00 <0.500 <1.50 Inter 1 31-May <0.250 <1.00 <0.500 <1.50 Inter 2 31-May <0.250 <1.00 <0.500 <1.50 Inter 3 31-May <0.250 <1.00 <0.500 <1.50 Post 31-May <0.250 <1.00 <0.500 <1.50 RBC - Occupational Inhalation/Ingestion , Notes: 1. Chemical analysis by EPA Method 8260/8260B. 2. MTBE = Methyl tert-butyl ether. 3. Pre = Pretreatment sample collected prior to carbon filtration. 4. Inter 1, Inter 2, and Inter 3 = Intermediate treatment samples collected between the first set of three parallel carbon canisters and the second set of three parallel carbon canisters. 5. Post = Post treatment sample collected after carbon filtration treatment. 6. ND = Compound not detected in sample. Reporting limit is not available. 7. < = Compound not detected in the sample at or above the indicated reporting limit. 8. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

9 Sheet 1 of 2 Table 2 - Water Supply Monitoring Data: Whoa Tavern Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Inter 23-Jan <1.0 <1.0 <1.0 <3.0 Post 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Pre 28-Mar <1.0 <1.0 <1.0 <3.0 Inter 28-Mar-06 <1.0 <1.0 <1.0 < Post 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 16-May <1.0 <1.0 <1.0 <3.0 Inter 16-May <1.0 <1.0 <1.0 <3.0 Post 16-May <1.0 <1.0 <1.0 <3.0 Pre 26-Jul <1.0 <1.0 <1.0 <3.0 Inter 26-Jul <1.0 <1.0 <1.0 <3.0 Post 26-Jul-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 26-Sep <1.0 <1.0 <1.0 <3.0 Inter 26-Sep <1.0 <1.0 <1.0 <3.0 Post 26-Sep-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 9-Nov <1.0 <1.0 <1.0 <3.0 Post 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 23-Jan <1.0 <1.0 <1.0 <3.0 Inter 23-Jan <1.0 <1.0 <1.0 <3.0 Post 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 13-Mar-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 13-Mar <1.0 <1.0 <1.0 <3.0 Post 13-Mar <1.0 <1.0 <1.0 <3.0 Pre 9-May <1.0 <1.0 <1.0 <3.0 Inter 9-May <1.0 <1.0 <1.0 <3.0 Post 9-May <1.0 <1.0 <1.0 <3.0 Pre 21-Aug <1.0 <1.0 <1.0 <3.0 Inter 21-Aug <1.0 <1.0 <1.0 <3.0 Post 21-Aug <1.0 <1.0 <1.0 <3.0 Pre 25-Sep <1.0 <1.0 <3.0 Inter 25-Sep <1.0 <1.0 <1.0 <3.0 Post 25-Sep <1.0 <1.0 <1.0 <3.0 Pre 5-Nov <2.00 <0.500 <1.50 Inter 5-Nov <0.500 <2.00 <0.500 <1.50 Post 5-Nov <0.500 <2.00 <0.500 <1.50 Pre 22-Feb <0.500 <0.500 <0.500 <1.00 Inter 22-Feb <0.500 <0.500 <0.500 <1.00 Post 22-Feb < <0.500 <1.00 Pre 18-Apr <0.500 <0.500 <0.500 <1.00 Inter 18-Apr <0.500 <0.500 <0.500 <1.00 Post 18-Apr <0.500 <0.500 <0.500 <1.00 Pre 18-Jun <0.500 <0.500 <0.500 <1.00 Inter 18-Jun <0.500 <0.500 <0.500 <1.00 Post 18-Jun <0.500 <0.500 <0.500 <1.00 RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

10 Sheet 2 of 2 Table 2 - Water Supply Monitoring Data: Whoa Tavern Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 22-Aug <0.500 <0.500 <0.500 <1.00 Inter 22-Aug <0.500 <0.500 <0.500 <1.00 Post 22-Aug <0.500 <0.500 <0.500 <1.00 Pre 8-Oct <0.500 <0.500 <0.500 <1.00 Inter 8-Oct <0.500 <0.500 <0.500 <1.00 Post 8-Oct <0.500 <0.500 <0.500 <1.00 Pre 8-Dec <0.500 <0.500 <1.00 Inter 8-Dec <0.500 <0.500 <0.500 <1.00 Post 8-Dec <0.500 <0.500 <0.500 <1.00 Pre 11-Feb <0.500 <0.500 <0.500 <1.00 Inter 11-Feb <0.500 <0.500 <0.500 <1.00 Post 11-Feb <0.500 <0.500 <0.500 <1.00 Pre 28-May <0.500 <0.500 <0.500 <1.00 Inter 28-May <0.500 <0.500 <0.500 <1.00 Post 28-May <0.500 <0.500 <0.500 <1.00 Pre 26-Aug <0.500 <0.500 <0.500 <1.00 Post 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Pre 7-Oct <0.250 <0.500 <0.500 <1.50 Post 7-Oct-09 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 2-Dec <0.250 <0.500 <0.500 <1.50 Post 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 18-Feb <0.250 <0.500 <0.500 <1.50 Post 18-Feb-10 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 29-Apr <0.250 <0.500 <0.500 <1.50 Post 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 9-Jun <0.250 <0.500 <0.500 <1.50 Post 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 9-Aug <0.250 <1.00 <0.500 <1.50 Post 9-Aug <0.250 <1.00 <0.500 <1.50 Pre 9-Nov <0.250 <1.00 <0.500 <1.50 Post 9-Nov <0.250 <1.00 <0.500 <1.50 Pre 7-Feb <0.250 <1.00 <0.500 <1.50 Post 7-Feb <0.250 <1.00 <0.500 <1.50 Pre 8-Apr <0.250 <1.00 <0.500 <1.50 Post 8-Apr <0.250 <1.00 <0.500 <1.50 Pre 31-May-11 <1.00 <0.250 <1.00 <0.500 <1.50 Post 31-May <0.250 <1.00 <0.500 <1.50 RBC - Occupational Inhalation/Ingestion , Notes: 1. Chemical analysis by EPA Method 8260/8260B. 2. MTBE = Methyl tert-butyl ether. 3. Pre = Pretreatment sample collected prior to carbon filtration. 4. Inter = Intermediate treatment sample collected between first and second carbon canister. 5. Post = Post treatment sample collected after carbon filtration treatment. 6. ND = Compound not detected in sample. Reporting limit is not available. 7. < = Compound not detected in the sample at or above the indicated reporting limit. 8. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

11 Sheet 1 of 2 Table 3 - Water Supply Monitoring Data: DeGrande Residence Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Residence Well: Pre 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Inter 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Post 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Pre 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Post 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 16-May-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 16-May-06 <1.0 <1.0 <1.0 <1.0 <3.0 Post 16-May <1.0 <1.0 <1.0 <3.0 Pre 26-Jul-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 26-Jul-06 <1.0 <1.0 <1.0 <1.0 <3.0 Post 26-Jul <1.0 <1.0 <1.0 <3.0 Pre 26-Sep-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 26-Sep-06 <1.0 <1.0 <1.0 <1.0 <3.0 Post 26-Sep <1.0 <1.0 <1.0 <3.0 Pre 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Post 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Post 23-Jan-07 <1.0 <1.0 <1.0 <1.0 < Mar May Aug Sep Nov Feb Apr Jun Aug Oct Dec Feb May Aug Oct Dec Feb-10 Pre 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Post 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Post 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 RBC - Residential Inhalation/Ingestion , Please refer to notes at end of table.

12 Sheet 2 of 2 Table 3 - Water Supply Monitoring Data: DeGrande Residence Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Residence Well: -- 9-Aug Sep Feb Apr May-11 Irrigation Well: Spigot 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Spigot 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Spigot 16-May <1.0 <1.0 <1.0 <3.0 Spigot 26-Jul <1.0 <1.0 <1.0 <3.0 Spigot 26-Sep <1.0 <1.0 <1.0 <3.0 Spigot 9-Nov <1.0 <1.0 <1.0 <3.0 Spigot 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Spigot 13-Mar-07 Not Sampled - Spigot Not Accessible Spigot 9-May-07 Not Sampled - Spigot Not Accessible Spigot 21-Aug-07 Not Sampled - Spigot Not Accessible Spigot 25-Sep-07 Not Sampled - Spigot Not Accessible Spigot 5-Nov-07 Not Sampled - Spigot Not Accessible Spigot 22-Feb-08 Not Sampled - Spigot Not Accessible Spigot 18-Apr-08 Not Sampled - Spigot Not Accessible Spigot 18-Jun-08 Not Sampled - Spigot Not Accessible Spigot 22-Aug-08 Not Sampled - Spigot Not Accessible Spigot 8-Oct-08 Not Sampled - Spigot Not Accessible Spigot 8-Dec-08 Not Sampled - Spigot Not Accessible Spigot 11-Feb-09 Not Sampled - Spigot Not Accessible Spigot 28-May-09 Not Sampled - Spigot Not Accessible Spigot 7-Oct-09 Not Sampled - Spigot Not Accessible Spigot 2-Dec-09 Not Sampled - Spigot Not Accessible Spigot 18-Feb-10 Not Sampled - Spigot Not Accessible Spigot 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Spigot 9-Jun-10 <1.00 <0.250 <0.500 <0.500 <1.50 Spigot 9-Aug-10 Not Sampled - Spigot Not Accessible Spigot 7-Feb-11 Not Sampled - Spigot Not Accessible Spigot 8-Apr-11 Not Sampled - Spigot Not Accessible Spigot 31-May-11 Not Sampled - Spigot Not Accessible RBC - Residential Inhalation/Ingestion , Notes: 1. Chemical analysis by EPA Method 8260/8260B. 2. MTBE = Methyl tert-butyl ether. 3. Pre = Pretreatment sample collected prior to carbon filtration. 4. Inter = Intermediate treatment sample collected between first and second carbon canister. 5. Post = Post treatment sample collected after carbon filtration treatment. 6. Spigot = Untreated sample collected from DeGrande irrigation well. 7. ND = Compound not detected in sample. Reporting limit is not available. 8. < = Compound not detected in the sample at or above the indicated reporting limit. 9. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

13 Sheet 1 of 2 Table 4 - Water Supply Monitoring Data: Welton Residence Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 23-Jan <1.0 <1.0 <1.0 <3.0 Inter 23-Jan <1.0 <1.0 <1.0 <3.0 Post 23-Jan <1.0 <1.0 <1.0 < Mar-06 No Sample Collected - System Down for Repair Pre 18-May-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 18-May <1.0 <1.0 <1.0 <3.0 Post 18-May-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 26-Jul-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 26-Jul <1.0 <1.0 <1.0 <3.0 Post 26-Jul-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 26-Sep-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 26-Sep <1.0 <1.0 <1.0 <3.0 Post 26-Sep-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 9-Nov <1.0 <1.0 <1.0 <3.0 Post 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Post 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 13-Mar-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 13-Mar <1.0 <1.0 <1.0 <3.0 Post 13-Mar-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 9-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 9-May <1.0 <1.0 <1.0 <3.0 Post 9-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 21-Aug <1.0 <1.0 <1.0 <3.0 Inter 21-Aug-07 <1.0 <1.0 <1.0 <1.0 <3.0 Post 21-Aug-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 25-Sep-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 25-Sep-07 <1.0 <1.0 <1.0 <1.0 <3.0 Post 25-Sep-07 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 5-Nov-07 <0.500 <0.500 <2.00 <0.500 <1.50 Inter 5-Nov <0.500 <2.00 <0.500 < Feb Apr-08 Pre 18-Jun-08 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 18-Jun-08 <1.00 <0.500 <0.500 <0.500 <1.00 Post 18-Jun-08 <1.00 <0.500 <0.500 <0.500 <1.00 Pre 22-Aug-08 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 22-Aug-08 <1.00 <0.500 <0.500 <0.500 <1.00 Post 22-Aug-08 <1.00 <0.500 <0.500 <0.500 < Oct-08 Pre 8-Dec-08 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 8-Dec-08 <1.00 <0.500 <0.500 <0.500 <1.00 Post 8-Dec-08 <1.00 <0.500 <0.500 <0.500 <1.00 RBC - Residential Inhalation/Ingestion , Please refer to notes at end of table.

14 Sheet 2 of 2 Table 4 - Water Supply Monitoring Data: Welton Residence Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Feb-09 Pre 28-May-09 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 28-May-09 <1.00 <0.500 <0.500 <0.500 <1.00 Post 28-May-09 <1.00 <0.500 <0.500 <0.500 <1.00 Pre 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Post 26-Aug-09 <1.00 <0.500 <0.500 <0.500 <1.00 Pre 7-Oct-09 <1.00 <0.250 <0.500 <0.500 >1.50 Inter 7-Oct-09 <1.00 <0.250 <0.500 <0.500 >1.50 Post 7-Oct-09 <1.00 <0.250 <0.500 <0.500 >1.50 Pre 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Post 2-Dec-09 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 18-Feb-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 18-Feb <0.250 <0.500 <0.500 <1.50 Post 18-Feb-10 <1.00 <0.250 <0.500 <0.500 <1.50 Pre 29-Apr-10 <1.00 <0.250 <0.500 <0.500 <1.50 Inter 29-Apr <0.250 <0.500 <0.500 <1.50 Post 29-Apr-10 <1.00 <0.250 <0.500 <0.500 < Jun Aug Nov Feb Apr May-11 RBC - Residential Inhalation/Ingestion , Notes: 1. Chemical analysis by EPA Method 8260/8260B. 2. MTBE = Methyl tert-butyl ether. 3. Pre = Pretreatment sample collected prior to carbon filtration. 4. Inter = Intermediate treatment sample collected between first and second carbon canister. 5. Post = Post treatment sample collected after carbon filtration treatment. 6. ND = Compound not detected in sample. Reporting limit is not available. 7. < = Compound not detected in the sample at or above the indicated reporting limit. 8. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

15 Sheet 1 of 3 Table 5 - Water Supply Monitoring Data: Keno Station Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 23-Jan-06 < <3.0 Inter 23-Jan <1.0 <1.0 <1.0 <3.0 Post 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 Pre 28-Mar-06 < Inter 28-Mar <1.0 <1.0 <1.0 <3.0 Post 28-Mar-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 16-May Inter 16-May <1.0 <1.0 <1.0 <3.0 Post 16-May-06 <1.0 <1.0 <1.0 <1.0 <3.0 Pre 26-Jul-06 <1.0 < <3.0 Inter 26-Jul <1.0 <1.0 <1.0 <3.0 Post 26-Jul J <1.0 <1.0 <1.0 <3.0 Pre 26-Sep-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 29-Sep <1.0 <1.0 <1.0 <3.0 Post 26-Sep <1.0 <1.0 <1.0 <3.0 Pre 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 9-Nov <1.0 <1.0 <1.0 <3.0 Post 9-Nov <1.0 <1.0 <1.0 <3.0 Pre 23-Jan-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 23-Jan <1.0 <1.0 <1.0 <3.0 Post 23-Jan <1.0 <1.0 <1.0 <3.0 Pre 13-Mar-07 <1.0 < <3.0 Inter 13-Mar <1.0 <1.0 <1.0 <3.0 Post 13-Mar <1.0 <1.0 <1.0 <3.0 Pre 9-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 Inter 9-May <1.0 <1.0 <1.0 <3.0 Post 9-May <1.0 <1.0 <1.0 <3.0 Pre 21-Aug <1.0 < <3.0 Inter 21-Aug <1.0 <1.0 <1.0 <3.0 Post 21-Aug <1.0 <1.0 <1.0 <3.0 Pre 25-Sep <1.0 <1.0 <1.0 <3.0 Inter 25-Sep <1.0 <1.0 <1.0 <3.0 Post 25-Sep <1.0 <1.0 <1.0 <3.0 Pre 5-Nov <0.500 <2.00 <0.500 <1.50 Inter 5-Nov <0.500 <2.00 <0.500 <1.50 Post 5-Nov <0.500 <2.00 <0.500 <1.50 Pre 22-Feb-08 <1.00 < <0.500 <1.00 Inter 22-Feb <0.500 <1.00 <0.500 <1.00 Post 22-Feb < <0.500 <1.00 RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

16 Sheet 2 of 3 Table 5 - Water Supply Monitoring Data: Keno Station Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 18-Apr-08 <1.00 < Inter 18-Apr <0.500 <0.500 <0.500 <1.00 Post 18-Apr <0.500 <0.500 <0.500 <1.00 Pre 18-Jun-08 <1.00 < <1.00 Inter 18-Jun <0.500 <0.500 <0.500 <1.00 Post 18-Jun <2.50 <2.50 <2.50 <5.00 Pre 22-Aug-08 <1.00 < <1.00 Inter 22-Aug <2.50 <2.50 <2.50 <5.00 Post 22-Aug <2.50 <2.50 <2.50 <5.00 Pre 8-Oct <0.500 <0.500 <0.500 <1.00 Inter 8-Oct <2.50 <2.50 <5.00 Post 8-Oct <2.50 <2.50 <2.50 <5.00 Pre 8-Dec-08 <1.00 <0.500 <0.500 <0.500 <1.00 Inter 8-Dec <1.00 <1.00 <1.00 <2.00 Post 8-Dec <2.50 <2.50 <2.50 <5.00 Pre 11-Feb-09 <1.00 <0.500 < <1.00 Inter 11-Feb <0.500 <0.500 <0.500 <1.00 Post 11-Feb <0.500 <0.500 <0.500 <1.00 Pre 28-May-09 <1.00 <0.500 < <1.00 Inter 28-May <1.00 <1.00 <1.00 <2.00 Post 28-May <2.50 <2.50 <2.50 <5.00 Pre 26-Aug-09 <1.00 < <1.00 Inter 26-Aug <0.500 <0.500 <0.500 <1.00 Post 26-Aug <2.50 <2.50 <2.50 <5.00 Pre 7-Oct-09 <1.00 <0.250 < <1.50 Inter 7-Oct <0.250 <0.500 <0.500 <1.50 Post 7-Oct <0.500 <1.00 <1.00 <3.00 Pre 2-Dec <0.250 <0.500 <0.500 <1.50 Inter 2-Dec <0.250 <0.500 <0.500 <1.50 Post 2-Dec <0.250 <0.500 <0.500 <1.50 Pre 18-Feb < <1.50 Inter 18-Feb <0.500 <0.500 <0.500 <1.50 Post 18-Feb <0.250 <0.500 <0.500 <1.50 Pre 29-Apr <0.500 <0.500 <1.50 Inter 29-Apr-10 1, <0.500 <0.500 <1.50 Post 29-Apr <0.250 <0.500 <0.500 <1.50 Pre 9-Jun-10 1, <2.50 <2.50 <7.50 Inter 9-Jun <2.50 <2.50 <7.50 Post 9-Jun <1.25 <2.50 <2.50 <7.50 Pre 9-Aug <0.250 <1.00 <0.500 <1.50 Inter 9-Aug <1.00 <0.500 <1.50 Post 9-Aug <0.250 <1.00 <0.500 <1.50 RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

17 Sheet 3 of 3 Table 5 - Water Supply Monitoring Data: Keno Station Keno Area Wide Groundwater Concentration in Micrograms per Liter (µg/l) Sampling Sampling Ethyl- Total Point Date MTBE Benzene Toluene Benzene Xylenes Pre 9-Nov <1.00 <0.500 <1.50 Inter 9-Nov <0.250 <1.00 <0.500 <1.50 Post 9-Nov <0.250 <1.00 <0.500 <1.50 Pre 7-Feb-11 <1.00 <0.250 <1.00 <0.500 <1.50 Inter 7-Feb <0.250 <1.00 <0.500 <1.50 Post 7-Feb <0.250 <1.00 <0.500 <1.50 Pre 8-Apr-11 <1.00 <0.250 < <1.50 Inter 8-Apr <0.250 <1.00 <0.500 <1.50 Post 8-Apr <0.250 <1.00 <0.500 <1.50 Pre 31-May-11 <1.00 <0.250 <1.00 <0.500 <1.50 Inter 31-May <0.250 <1.00 <0.500 <1.50 Post 31-May <0.250 <1.00 <0.500 <1.50 RBC - Occupational Inhalation/Ingestion , Notes: 1. Chemical analysis by EPA Method 8260/8260B. 2. MTBE = Methyl tert-butyl ether. 3. Pre = Pretreatment sample collected prior to carbon filtration. 4. Inter = Intermediate treatment sample collected between first and second carbon canister. 5. Post = Post treatment sample collected after carbon filtration treatment. 6. Spigot = Sample collected from a spigot located at the well head. 7. ND = Compound not detected in sample. Reporting limit is not available. 8. < = Compound not detected in the sample at or above the indicated reporting limit. 9. J = Analytical result is below the method reporting limit and is estimated. 10. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

18 Sheet 1 of 4 Table 6 - Chemical Analysis Results Summary: Gasoline-Range TPH Keno Area Wide Groundwater Sampling Sampling Concentrations in Point Date Micrograms per Liter (µg/l) Monitoring Wells MW-1 29-Apr-10 <100 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 MW-2 29-Apr-10 <100 9-Aug-10 well was dry 9-Nov-10 Not Accessible for Sampling 7-Feb-11 <100 MW-4 29-Apr-10 <100 9-Aug-10 <100 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 31-May-11 <100 HC-5 29-Apr-10 <100 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 HC-6 29-Apr-10 <100 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 HC-7 29-Apr-10 <100 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 Supply Wells School Pre 29-Apr-10 <100 9-Jun-10 < Aug-10 <200 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 School Inter 1 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 RBC - Residential Inhalation/Ingestion 100 RBC - Occupational Inhalation/Ingestion 420 Please refer to notes at end of table.

19 Sheet 2 of 4 Table 6 - Chemical Analysis Results Summary: Gasoline-Range TPH Keno Area Wide Groundwater Sampling Sampling Concentrations in Point Date Micrograms per Liter (µg/l) School Inter 2 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 School Inter 3 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 School Post 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 Tavern Pre 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 Tavern Post 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 DeGrande Pre 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling RBC - Residential Inhalation/Ingestion 100 RBC - Occupational Inhalation/Ingestion 420 Please refer to notes at end of table.

20 Sheet 3 of 4 Table 6 - Chemical Analysis Results Summary: Gasoline-Range TPH Keno Area Wide Groundwater Sampling Sampling Concentrations in Point Date Micrograms per Liter (µg/l) DeGrande Inter 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling DeGrande Post 29-Apr-10 <100 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling DeGrande Irrigation 9-Jun-10 <100 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling Welton Pre 29-Apr-10 <100 9-Jun-10 Not Accessible for Sampling 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling Welton Inter 29-Apr-10 <100 9-Jun-10 Not Accessible for Sampling 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling Welton Post 29-Apr-10 <100 9-Jun-10 Not Accessible for Sampling 9-Aug-10 Not Accessible for Sampling 9-Nov-10 Not Accessible for Sampling 7-Feb-11 Not Accessible for Sampling 8-Apr-11 Not Accessible for Sampling 31-May-11 Not Accessible for Sampling Station Pre 29-Apr-10 <100 9-Jun-10 <500 9-Aug-10 <100 9-Nov-10 <100 RBC - Residential Inhalation/Ingestion 100 RBC - Occupational Inhalation/Ingestion 420 Please refer to notes at end of table.

21 Sheet 4 of 4 Table 6 - Chemical Analysis Results Summary: Gasoline-Range TPH Keno Area Wide Groundwater Sampling Sampling Concentrations in Point Date Micrograms per Liter (µg/l) Station Pre 7-Feb-11 <100 (cont.) 8-Apr-11 < May-11 <100 Station Inter 29-Apr-10 <100 9-Jun-10 <500 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 Station Post 29-Apr-10 <100 9-Jun-10 <500 9-Aug-10 <100 9-Nov-10 <100 7-Feb-11 <100 8-Apr-11 < May-11 <100 Buckingham 29-Apr-10 <100 9-Aug-10 <100 Leslie 29-Apr-10 <100 9-Aug-10 <100 Parker 29-Apr-10 <100 9-Aug-10 <100 Brown 9-Aug-10 <100 RBC - Residential Inhalation/Ingestion 100 RBC - Occupational Inhalation/Ingestion 420 Notes: 1. Gasoline-Range Total Petroleum Hydrocarbons (TPH) by Northwest Method NWTPH-Gx. 2. < = Compound not present in sample at or above the indicated value. 3. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

22 Sheet 1 of 2 Table 7 - Groundwater Elevations and Field Parameters in Monitoring Wells Keno Area Wide Groundwater Monitoring Depth Dissolved Specific Well Sampling to Groundwater Oxygen ph Conductance Temperature (Elevation) Date Groundwater Elevation (MSL) (mg/l) (µmhos/cm) ( C) MW-1 23-Jan (4,113.84) 9-Nov May Nov Apr Oct Equipment Malfunction - No Data Collected 28-May Oct Apr Aug Nov Feb MW-2 23-Jan (4,115.90) 9-Nov May Nov May Nov Apr Oct Equipment Malfunction - No Data Collected 28-May Oct Apr Aug-10 Dry < * Dry - Parameters Not Measured 9-Nov Monument Frozen Shut - No Sample Collected 7-Feb MW-4 23-Jan Monument Frozen Shut - No Sample Collected (4,105.21) 9-Nov May Nov Well Not Accessible 18-Apr Oct Equipment Malfunction - No Data Collected 28-May Oct Apr Aug Nov Monument Frozen Shut - No Sample Collected 7-Feb Well Not Accessible 31-May Please refer to notes at end of table.

23 Sheet 2 of 2 Table 7 - Groundwater Elevations and Field Parameters in Monitoring Wells Keno Area Wide Groundwater Monitoring Depth Dissolved Specific Well Sampling to Groundwater Oxygen ph Conductance Temperature (Elevation) Date Groundwater Elevation (MSL) (mg/l) (µmhos/cm) ( C) HC-5 29-Apr (4,128.60) 9-Aug Nov Feb HC-6 29-Apr (4,110.61) 9-Aug Nov Feb HC-7 29-Apr (4,105.81) 9-Aug Nov Feb Notes: 1. Groundwater elevations are referenced to mean sea elevation (MSL) = Parameter not measured or unavailable. 3. mg/l = Milligrams per Liter 4. µmhos/cm = Micro Ohms per Centimeter. 5. C = Degrees Celsius. 6. *Well was dry at 114 feet bgs.

24 Sheet 1 of 2 Table 8 - Chemical Analysis Results Summary: BTEX and MTBE in Monitoring Wells Keno Area Wide Groundwater Monitoring Concentrations in Micrograms per Liter (µg/l) Well Sampling Ethyl- Total Identification Date MTBE Benzene Toluene Benzene Xylenes MW-1 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 8-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 5-Nov-07 <0.500 <0.500 <2.0 <0.500 < Apr-08 <1.00 <0.500 <0.500 <0.500 < Oct <0.500 <0.500 <0.500 < May-09 <1.00 <0.500 <0.500 <0.500 < Oct-09 <1.00 <0.250 <0.500 <0.500 < Apr-10 <1.00 <0.250 <0.500 <0.500 < Aug-10 <1.00 <0.250 <1.00 <0.500 < Nov-10 <1.00 <0.250 <1.00 <0.500 < Feb-11 <1.00 <0.250 <1.00 <0.500 <1.50 MW-2 23-Jan-06 <2.0 <1.0 <1.0 <1.0 <3.0 9-Nov-06 <1.0 <1.0 <1.0 <1.0 <3.0 8-May-07 <1.0 <1.0 <1.0 <1.0 <3.0 5-Nov-07 <0.500 <0.500 <2.0 <0.500 < Apr-08 <1.00 <0.500 <0.500 <0.500 < Oct-08 <1.00 <0.500 <0.500 <0.500 < May-09 <1.00 <0.500 <0.500 <0.500 < Oct-09 <1.00 <0.250 <0.500 <0.500 < Apr-10 <1.00 <0.250 <0.500 <0.500 < Aug-10 9-Nov-10 Well Dry - No Sample Collected Well Inaccessible - No Sample Collected 7-Feb-11 <1.00 <0.250 <1.00 <0.500 <1.50 MW-4 23-Jan-06 Well Inaccessible - No Sample Collected 9-Nov <1.0 <1.0 <1.0 <3.0 8-May <1.0 <1.0 <1.0 <3.0 5-Nov-07 Well Inaccessible - No Sample Collected 18-Apr <0.500 <0.500 <0.500 < Oct-08 <1.00 <0.500 <0.500 <0.500 < May-09 <1.00 <0.500 <0.500 <0.500 < Oct-09 <1.00 <0.250 <0.500 <0.500 < Apr-10 <1.00 <0.250 <0.500 <0.500 < Aug-10 <1.00 <0.250 <1.00 <0.500 < Nov-10 Well Inaccessible - No Sample Collected 7-Feb-11 Well Inaccessible - No Sample Collected 31-May-11 <1.00 <0.250 <1.00 <0.500 <1.50 RBC - Residential Inhalation/Ingestion , RBC - Occupational Inhalation/Ingestion , Please refer to notes at end of table.

25 Sheet 2 of 2 Table 8 - Chemical Analysis Results Summary: BTEX and MTBE in Monitoring Wells Keno Area Wide Groundwater Monitoring Concentrations in Micrograms per Liter (µg/l) Well Sampling Ethyl- Total Identification Date MTBE Benzene Toluene Benzene Xylenes HC-5 29-Apr-10 <1.00 <0.250 <0.500 <0.500 < Aug-10 <1.00 <0.250 <1.00 <0.500 < Nov-10 <1.00 <0.250 <1.00 <0.500 < Feb-11 <1.00 <0.250 <1.00 <0.500 <1.50 HC-6 29-Apr-10 <1.00 < <0.500 < Aug-10 <1.00 <0.250 <1.00 <0.500 < Nov-10 <1.00 <0.250 <1.00 <0.500 < Feb-11 <1.00 <0.250 <1.00 <0.500 <1.50 HC-7 29-Apr <0.250 <0.500 <0.500 < Aug-10 <1.00 <0.250 <1.00 <0.500 < Nov-10 <1.00 <0.250 <1.00 <0.500 < Feb-11 <1.00 <0.250 <1.00 <0.500 <1.50 RBC - Residential Inhalation/Ingestion , RBC - Occupational Inhalation/Ingestion , Notes: 1. BTEX/MTBE analyses by EPA Method 8260/8260B = Not analyzed. 3. ND = Compound not detected in sample. Reporting limit is not known. 4. < = Compound not present in sample at or above the indicated value. 5. RBCs are from Risk-Based Concentrations (RBCs) for Individual Chemicals (DEQ, Revision: September 15, 2009).

26 Site F:\Data\Jobs\DEQ\ Keno ARRA\Task 4 GW Sampling and Procurement\5-11 Status Rpt\Figures\ (Site Location Map).cdr Portland OREGON Keno Note: Base map prepared from the USGS 7.5-minute quadrangles of Keno, OR provisional edition, 1985 and Hamaker Mtn., OR-CA provisional edition N 0 2,000 4,000 Scale in Feet Area Wide Groundwater Site Location Map /Task 4 6/11 Figure 1

27 Morgan Way Leslie DeGrande Residence Brown Fern Avenue Parker HC-7 DeGrande Irrigation River Street Brighton Avenue (Hwy. 66) Park Street Ferry Street Klamath River Buckingham MW-4 F:\Data\Jobs\DEQ\ Keno ARRA\Task 4 GW Sampling and Procurement\5-11 Status Rpt\Figures\ (Site Plan).cdr Green Spring Road (Hwy. 66) Treatment System DeGrande Residence Buckingham DeGrande Irrigation MW-1 Former Maintenance Building CountyRoad Keno Elementary School Keno Station Keno Worden Water Supply Well/Treatment System Location and Designation Domestic Well Location and Designation Irrigation Well Location and Designation Monitoring Well Location and Number Whoa Tavern MW-1 Former Klamath County Property MW-2 HC-5 Source: Base map prepared from a site plan by Jacobs Engineering Group, Inc. HC-6 Keno Elementary School Water Supply Well Keno Elementary School Property Welton Residence Kingsbury Residence N Scale in Feet Keno Area Wide Groundwater Site Plan /Task 4 6/11 Figure 2

28 Hart Crowser /Task 4 June 15, 2011 ATTACHMENT A ANALYTICAL LABORATORY REPORTS

29 Apex Labs S.W. Garden Place Tigard, OR Phone Fax Tuesday, June 14, 2011 Leon Lahiere Hart Crowser, Inc SW Gemini Drive Beaverton, OR RE: Keno / /Tk4 Enclosed are the results of analyses for work order A11F059, which was received by the laboratory on 6/3/2011 at 1:55:00PM. Thank you for using Apex Labs. We appreciate your business and strive to provide the highest quality services to the environmental industry. If you have any questions concerning this report or the services we offer, please feel free to contact me by at: dthomas@apex-labs.com, or by phone at Apex Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Darwin Thomas, Business Development Director Page 1 of 16

30 Apex Labs S.W. Garden Place Tigard, OR Phone Fax Hart Crowser, Inc. Project: Keno 8910 SW Gemini Drive Project Number: /Tk4 Reported: Beaverton, OR Project Manager: Leon Lahiere 06/14/11 05:15 ANALYTICAL REPORT FOR SAMPLES SAMPLE INFORMATION Sample ID Laboratory ID Matrix Date Sampled Date Received School Pre School Inter 1 School Inter 2 School Inter 3 School Post School Post D Tavern Pre Tavern Post Station Pre Station Inter A11F Water 05/31/11 16:35 06/03/11 13:55 A11F Water 05/31/11 16:05 06/03/11 13:55 A11F Water 05/31/11 16:10 06/03/11 13:55 A11F Water 05/31/11 16:15 06/03/11 13:55 A11F Water 05/31/11 16:25 06/03/11 13:55 A11F Water 05/31/11 16:25 06/03/11 13:55 A11F Water 05/31/11 16:55 06/03/11 13:55 A11F Water 05/31/11 16:50 06/03/11 13:55 A11F Water 05/31/11 17:25 06/03/11 13:55 A11F Water 05/31/11 17:20 06/03/11 13:55 Apex Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Darwin Thomas, Business Development Director Page 2 of 16

31 Apex Labs S.W. Garden Place Tigard, OR Phone Fax Hart Crowser, Inc. Project: Keno 8910 SW Gemini Drive Project Number: /Tk4 Reported: Beaverton, OR Project Manager: Leon Lahiere 06/14/11 05:15 ANALYTICAL SAMPLE RESULTS Gasoline Range Hydrocarbons (Benzene to Naphthalene) by NWTPH-Gx Analyte Result MDL Reporting Limit Units Dilution School Pre (A11F059-01) Matrix: Water Batch: Date Analyzed Gasoline Range Organics ND ug/l 1 06/03/11 17:32 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 99 % Limits: % 1,4-Difluorobenzene (Sur) 91 % Limits: % School Inter 1 (A11F059-02) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 17:58 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 100 % Limits: % 1,4-Difluorobenzene (Sur) 90 % Limits: % School Inter 2 (A11F059-03) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 18:23 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 99 % Limits: % 1,4-Difluorobenzene (Sur) 94 % Limits: % School Inter 3 (A11F059-04) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 18:49 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 99 % Limits: % 1,4-Difluorobenzene (Sur) 94 % Limits: % School Post (A11F059-05) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 19:15 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 104 % Limits: % 1,4-Difluorobenzene (Sur) 95 % Limits: % School Post D (A11F059-06) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 19:40 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 99 % Limits: % 1,4-Difluorobenzene (Sur) 93 % Limits: % Tavern Pre (A11F059-07) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 20:06 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 103 % Limits: % 1,4-Difluorobenzene (Sur) 93 % Limits: % Tavern Post (A11F059-08) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 20:32 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 104 % Limits: % 1,4-Difluorobenzene (Sur) 94 % Limits: % Station Pre (A11F059-09) Matrix: Water Batch: Gasoline Range Organics ND ug/l 1 06/03/11 20:57 Surrogate: 4-Bromofluorobenzene (Sur) Recovery: 106 % Limits: % 1,4-Difluorobenzene (Sur) 96 % Limits: % Method NWTPH-Gx NWTPH-Gx NWTPH-Gx NWTPH-Gx NWTPH-Gx NWTPH-Gx NWTPH-Gx NWTPH-Gx NWTPH-Gx Notes Apex Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. Darwin Thomas, Business Development Director Page 3 of 16